Northern California's largest sandcastle competition: teams of architects, engineers and local elementary-school students build giant sand sculptures on Ocean Beach, with live music, performances, food trucks and an award ceremony. Free to attend; a fundraiser for Leap Arts in Education (now part of Youth Art Exchange).
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Liminal Playground transforms Burning Man Decompression in San Francisco into an immersive day‑night experience of art, performance, music, and burner culture.
Public star party at Candlestick Point State Recreation Area, hosted by the SFAA.
Open water swim at Aquatic Park in San Francisco.
Cal Hacks 13.0 (3601 Lyon St, San Francisco) — 36‑hour hackathon offering workshops, industry mentors, corporate partners, food, swag, and prize pool of cash and devices.
High‑energy Zumba routines fill the County Fair Building, dancing participants to upbeat music; water bottles and workout shoes recommended, all ages.
Scaregrove Halloween Event at Sigmund Stern Grove — free Halloween fun for all ages.
Calixto Robles leads a community altar creation while René y Familia provides live bilingual folk music, inviting contributions of flowers, photos, incense, and keepsakes, all ages.
Midburn takes place at Burning Man Decompression in San Francisco.
